Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/899#discussion_r17195370
--- Diff:
yarn/common/src/main/scala/org/apache/spark/deploy/yarn/ClientBase.scala ---
@@ -309,7 +310,7 @@ trait ClientBase extends Logging {
// Add Xmx for AM memory
JAVA_OPTS += "-Xmx" + amMemory + "m"
- val tmpDir = new Path(Environment.PWD.$(),
YarnConfiguration.DEFAULT_CONTAINER_TEMP_DIR)
+ val tmpDir = new Path(Environment.PWD.$$(),
YarnConfiguration.DEFAULT_CONTAINER_TEMP_DIR)
--- End diff --
It seems the only way to special case this is through reflection. Otherwise
it won't even compile for < 2.4. I'm not sure if we need a config here; it
seems we can just try to load the `$$` method, and if it's not there we
fallback to `$`. Same goes for `ApplicationConstants.CLASS_PATH_SEPARATOR`
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